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"Hee-Beom Yang"

Original Articles

[English]
Neuroblastoma: A 2020 Survey Conducted by the Korean Association of Pediatric Surgeons
Hee-Beom Yang, Soo Min Ahn, Min Jeng Cho, Yong-Hoon Cho, Soo Jin Na Choi, Yoon Mi Choi, Jae Hee Chung, Seok Joo Han, In Geol Ho, Jeong Hong, Kyong Ihn, Yeon Jun Jeong, Eunyoung Jung, Dae Youn Kim, Hae-Young Kim, Ki Hoon Kim, Seong Chul Kim, Soo-Hong Kim, Eun-Jung Koo, Hyun Hee Kwon, Yong Jae Kwon, Nam-Hyuk Lee, Ju Yeon Lee, Sanghoon Lee, Jung-Man Namgoong, Chaeyoun Oh, Jung-Tak Oh, Jin Young Park, Junbeom Park, Jeong-Meen Seo, Jae Ho Shin, Hyun Beak Shin, Joohyun Sim, Jiyoung Sul, Joon Kee Youn, Hyun-Young Kim
Adv Pediatr Surg 2025;31(2):66-76.   Published online November 25, 2025
DOI: https://doi.org/10.13029/aps.2025.31.2.66
Purpose
To report a nationwide survey on neuroblastoma conducted by the Korean Association of Pediatric Surgeons (KAPS) in 2020.
Methods
The clinical data of pediatric patients diagnosed with and treated for neuroblastoma from 2005 to 2019 in 19 hospitals of KAPS members were collected. Survival and prognostic factor analyses were performed using the log rank test and Cox proportional hazard analysis. A p-value <0.05 was considered significant.
Results
A total of 669 patients with neuroblastoma were registered for the study. The results were presented and discussed at the 36th annual meeting of the KAPS, which was held in Seoul on August 21, 2020.
Conclusion
This study provides information on patient demographics, prognostic outcomes, and comprehensive treatment outcomes for neuroblastoma. The study is expected to be an important reference for improving pediatric surgeons’ understanding and treatment of neuroblastoma.
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[English]
Perception on the Intestinal Malrotation: A 2021 Survey Conducted by the Korean Association of Pediatric Surgeons
Hee-Beom Yang, Min Jeng Cho, Yu Jeong Cho, Yoon Mi Choi, Jae Hee Chung, Seok Joo Han, Jeong Hong, Eunyoung Jung, Ki Hoon Kim, Soo-Hong Kim, Cheol-Gu Lee, Nam-Hyuk Lee, Ju Yeon Lee, Sanghoon Lee, Suk Bae Moon, Young-Hyun Na, So Hyun Nam, Chaeyoun Oh, Jin Young Park, Junbeom Park, Tae-Jin Park, Jae Ho Shin, Joonhyuk Son, Hyun-Young Kim, The Korean Association of Pediatric Surgeons
Adv Pediatr Surg 2025;31(2):59-65.   Published online August 5, 2025
DOI: https://doi.org/10.13029/aps.2025.31.2.59
Purpose
To report the findings of a perception survey on intestinal malrotation conducted by the Korean Association of Pediatric Surgeons (KAPS) in 2021.
Methods
The perceptions on intestinal malrotation regarding clinical decision making of the KAPS members were collected through web-based survey.
Results
A total of 22 surgeons were answered for this study. The results were presented and discussed at the 37th annual meeting of KAPS, which was held in Seoul on June 18, 2021.
Conclusion
This study provides the clinical decisions of the KAPS members on the intestinal malrotation. The study is expected to be an important reference for improving pediatric surgeons’ understanding and treatment of intestinal malrotation.
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[English]
Comparative Analysis of National Surveys of Intestinal Atresia: A Retrospective Study by the Korean Association of Pediatric Surgeons
Jinyoung Park, Dayoung Ko, Eun-jung Koo, Hyunhee Kwon, Ki Hoon Kim, Dae Yeon Kim, Seong Chul Kim, Soo-Hong Kim, Wontae Kim, HaeYoung Kim, Hyun-Young Kim, So Hyun Nam, Jung-Man Namgoong, Junbeom Park, Taejin Park, Min-Jung Bang, Jeong-Meen Seo, Ji-Young Sul, Joonhyuk Son, Joohyun Sim, Soo Min Ahn, Hee-Beom Yang, Jung-Tak Oh, Chaeyoun Oh, Joong Kee Youn, Sanghoon Lee, Ju Yeon Lee, Kyong Ihn, Hye Kyung Chang, Yeon Jun Jeong, Eunyoung Jung, Jae Hee Chung, Min Jeong Cho, Yun-Mee Choe, Seok Joo Han, In Geol Ho, Jeong Hong
Adv Pediatr Surg 2025;31(1):8-15.   Published online May 28, 2025
DOI: https://doi.org/10.13029/aps.2025.31.1.8
Purpose
This study aims to investigate and compare the incidence, demographic characteristics, clinical manifestations, preoperative diagnostic methods, anatomical classifications, associated anomalies, operative treatments, and postoperative outcomes of patients with intestinal atresia treated by the members of the Korean Association of Pediatric Surgeons (KAPS) through three nationwide surveys.
Methods
KAPS conducted 3 national surveys in 1998, 2010, and 2024 to examine the patients diagnosed with intestinal atresia. In preparation for the survey, we developed a customized case registration form to obtain data on patient sex, birth weight, gestational age, clinical manifestations, preoperative diagnostic methods, anatomical types, associated anomalies, operative treatments, and postoperative outcomes. Authorized KAPS members completed the case registration form.
Results
The first, second, and third national surveys included 218, 222, and 236 individuals diagnosed with intestinal atresia, respectively. The male-to-female ratios were 1.5:1, 1.1:1, and 1.1:1, respectively. The first, second, and third national surveys revealed that 34.3%, 43.3%, and 53.4% of patients were born before 37 weeks of gestation, respectively. Additionally, 28.7%, 32.0%, and 40.7% of patients had a birth weight under 2,500 g. In the third national survey, duodenoduodenostomy was the most common procedure, performed in 70 out of 82 patients diagnosed with duodenal atresia. Resection and anastomosis were the main surgical procedures conducted in 47 out of 54 cases of jejunal atresia and 74 out of 92 cases of ileal atresia. The mortality rates in the first, second, and third national surveys were 13.8%, 3.6%, and 1.3% respectively, with the lowest rate observed in the third national survey.
Conclusion
These national surveys offer valuable insights into the current state of intestinal atresia, including specific surgical interventions and postoperative outcomes in South Korea. For pediatric surgeons aiming to enhance their understanding of intestinal atresia and its treatment options, these surveys could be an indispensable resource and guide.
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[English]
Comparison of the Surgical Outcomes between Open Fundoplication and Laparoscopic Fundoplication in Children with Gastroesophageal Reflux Disease
Su young Hong, Hee-Beom Yang, Sao Thi Han, Hyun-Young Kim, Sung Eun Jung
Adv Pediatr Surg 2019;25(2):51-59.   Published online December 17, 2019
DOI: https://doi.org/10.13029/aps.2019.25.2.51
Purpose

This study aimed to compare the outcomes of open fundoplication (OF) and laparoscopic fundoplication (LF) in children with gastroesophageal reflux disease (GERD).

Methods

We retrospectively reviewed the electronic medical charts of pediatric patients who underwent fundoplication for GERD between January 2005 and May 2018 at the Korean tertiary hospital. Patient characteristics, operation type, associated diagnosis, operation history, neurologic impairment, postoperative complication, recurrence, and operation outcomes were investigated. The Mann-Whitney U test or Student's t-test was used to evaluate continuous data as appropriate. The χ2 test was used to analyze categorical data.

Results

A total of 92 patients were included in this study; 50 were male and 42 were female. Forty-eight patients underwent OF and 44 patients underwent LF. Patient characteristics, such as sex ratio, gestational age, symptoms, neurological impairment, and history of the previous operation were not different between the two groups. A longer operative time (113.0±56.0 vs. 135.1±49.1 minutes, p=0.048) was noted for LF. There was no significant difference in operation time when the diagnosis was limited to only GERD, excluding patients with other combined diseases. Other surgical outcomes, such as intraoperative blood loss, transfusion rate, hospital stay, and recurrence rate were not significantly different between the 2 groups. The complication rate was slightly higher in the OF group than in the LF group; however, the difference was not significant (20.8% vs. 11.4%, p=0.344).

Conclusion

LF is as safe, feasible, and effective as OF for the surgical treatment of GERD in children.

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Case Report

[English]
Successful Correction of Long Gap Esophageal Atresia with Gastric Tube through Totally Laparoscopic and Thoracoscopic Procedure
Hee-Beom Yang, Hyun-Young Kim, Sung Eun Jung
Adv Pediatr Surg 2019;25(1):24-28.   Published online June 28, 2019
DOI: https://doi.org/10.13029/aps.2019.25.1.24

Esophageal atresia (EA) is a diverse disease entity. We present a case of long gap EA without fistula corrected through totally laparoscopic and thoracoscopic esophageal replacement using gastric tube. A male baby weighing 3,000 g, with suspicion of EA, was born at gestational age of 37+6 weeks. Gastrostomy was made at an age of two days; seven months later, definite operation was planned. We determined to perform the gastric tube replacement due to long gap revealed by fluoroscopy. Gastric mobilization, gastric tube formation, and pyloroplasty were performed laparoscopically. An isoperistaltic 9 cm gastric tube was made using 2 Endo GIA 45, and interrupted end-to-end esophago-esophagostomy was performed thoracoscopically. With laparoscopy, gastropexy to the diaphragm was performed through the interrupted suture. Operation time was 370 minutes; there was no intraoperative event. Postoperative course was uneventful. He underwent esophageal balloon dilatation due to anastomosis stenosis in the months after surgery.

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Review Article

[English]
Enterostomy Closure after Acute Abdomen in Neonate and Infant
Hee-Beom Yang, Hyun-Young Kim
Adv Pediatr Surg 2018;24(2):35-43.   Published online December 24, 2018
DOI: https://doi.org/10.13029/aps.2018.24.2.35

The risk of acute abdomen in neonates and infants is generally increased due to advanced maternal age and neonatal intensive care unit care development. Enterostomy is a safe procedure for acute abdomen in neonates and infants. However, there is no consensus for the optimal timing of enterostomy closure (EC). A few considerations should be reviewed for deciding the timing of stoma closure to obtain the best outcome. Distal loopography is commonly performed upon examination to ascertain the existence of a distal passage after EC, detect signs of disease-specific complications, and assess the need of surgery in addition to EC. Pathology review is also one important pre-closure consideration. When the incidence of a hypoganglionosis or an aganglionosis combined with acute abdomen is observed in neonates and infants, thorough examinations should be performed to conclusively determine whether there is no passage disturbance of the distal bowel. Refeeding not only provides information about chance to grow, electrolyte imbalance correction, and proximal and distal bowel size match, but also provides information about distal bowel passage when there is a doubtful distal loopography or pathology result. Early closure enables growth spurt with the correction of water/electrolyte imbalance. It potentially reduced medical costs, less discrepancy between proximal and distal bowel size. Some factors favoring a late stoma closure may be due to less postoperative complications, early recovery, shorter time of total parenteral nutrition after EC, and decreased length of hospitalization after the EC. Some studies have shown controversial results. In summary, a pre-closure evaluation is imperative to assure the safety of an EC. The optimal timing of an EC remains controversial. For this reason, individualized approach is needed after reviewing the general condition of each patient. Further prospective study on optimal timing of stoma closure including a randomized clinical trial is needed.

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Original Articles

[English]
Is Preoperative Ultrasonography Necessary in Pediatric Inguinal Hernia?
Ji-Won Han, Joong Kee Youn, Hee-Beom Yang, Chaeyoun Oh, Hyun-Young Kim, Sung-Eun Jung
J Korean Assoc Pediatr Surg 2018;24(1):5-9.   Published online June 30, 2018
DOI: https://doi.org/10.13029/jkaps.2018.24.1.5
Purpose

Preoperative ultrasonography (USG) in pediatric inguinal hernia has controversy. In this study, we analyzed the cases of pediatric inguinal hernia with/without preoperative USG and discussed whether USG is necessary.

Methods

We reviewed medical records of 1,441 patients who underwent inguinal hernia repair in Seoul National University Children's Hospital between January 2011 and August 2016 retrospectively.

Results

Male were 69.3% and age at operation was 37.8±36.5 months old. There were 150 patients (10.4%) performed USG preoperatively. The department ordered to perform USG included department of surgery (n=71), emergency medicine (n=42), pediatrics (n=26), urology (n=10) and outside hospital (n=1). The reasons of performing USG included evaluation for hernia laterality (n=82), incarceration (n=28), testis (n=15), request of parents (n=14), scrotal mass (n=6) and incidentally found during evaluation for another disease (n=5). Excepting 5 cases of incidental finding, of 145 cases with USG, 12 (8.3%) cases changed the surgical plan; change to bilateral repair from unilateral repair (n=5), emergency operation due to incarceration (n=4) which include 1 salpingo-oophorectomy, 1 open abdomen surgery and 2 hernia repair after reduction of ovary, change to co-operation of orchiopexy (n=2) and change to laparoscopic surgery from open surgery due to herniation of both ovaries into one inguinal canal (n=1). In group without USG (n=1,291), 5 patients (0.4%) had unexpected problems during operation; 2 co-operation of orchiopexy because of transverse testicular ectopia (n=1) and right undescended testis (n=1), 2 hypertrophy of major labia and 1 retroperitoneal lymphangioma at inguinal area misdiagnosed as inguinal hernia.

Conclusion

It was difficult to interpret the meaning of preoperative USG because not all patients had performed it. In this study, 10.4% of patients performed USG and 8.3% of them changed surgical plan. About 0.4% of patients without preoperative USG would have benefited from it for surgery if they had performed it. Since the percentage is too low, it is unreasonable to conclude that USG has diagnostic utility in inguinal hernia in this study.

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[English]
Thyroid Cancer in Pediatric Age: A Single Institution Experience
Hyo-Jun Kim, Ji-Won Han, Joong Kee Youn, Hee-Beom Yang, Chaeyoun Oh, Hyun-Young Kim, Sung-Eun Jung, Kwi-Won Park
J Korean Assoc Pediatr Surg 2017;23(2):42-47.   Published online December 20, 2017
DOI: https://doi.org/10.13029/jkaps.2017.23.2.42
Purpose

Thyroid cancer is a rare disease in pediatric population, but its incidence rate is increasing. The aim of this report is to present a single institution experience of pediatric thyroid cancer and to identify clinical features, predisposing factors, and postoperative course of pediatric thyroid cancer.

Methods

We retrospectively reviewed 35 pediatric patients who underwent operation due to thyroid cancer at Seoul National University Children's Hospital between May 1997 and January 2017. The median follow-up period was 70 months (range, 5–238 months).

Results

The mean age at operation was 12.0±5.91 years and 27 patients were female. The underlying conditions in patients included history of chemoradiotherapy for previous other malignancies (n=4), hypothyroidism (n=3), history of chemotherapy (n=2), family history of thyroid cancer (n=1) and history of radiation therapy (n=1). The initial symptoms were palpable neck mass (n=21) and incidental findings (n=11). Total thyroidectomy (n=30) or unilateral lobectomy (n=5) were performed. There were 15 postoperative complications including transient hypocalcemia in 14 patients and Horner's syndrome in 1 patient. The most common pathologic cell type was papillary thyroid cancer (n=29). Extrathyroid extension and lymph node invasion were found in 25 patients and 27 patients, respectively. Thirteen patients showed multifocality. During follow-up period, 5 patients underwent additional operation because of tumor recurrence in lymph nodes. Lung metastasis was detected in 3 patients at the time of diagnosis and in 3 patients during follow-up period. The mortality rate was zero and mean disease-free survival was 83.7±47.9 months.

Conclusion

Pediatric thyroid cancer has lower mortality rate and recurrence rate as seen in this study despite the advanced stage at diagnosis. A thorough follow-up of patients with an underlying condition such as history of chemoradiotherapy and understanding new pediatric guideline can be helpful to maximize patients' survival and prognosis.

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[English]
Early Experience of Pediatric Thoracoscopic Surgery Performed by a Pediatric Surgeon
Jong-Ho Cheun, Ji-Won Han, Joong Kee Youn, Hee-Beom Yang, Chaeyoun Oh, Hyun-Young Kim, Sung-Eun Jung
J Korean Assoc Pediatr Surg 2017;23(2):29-36.   Published online December 20, 2017
DOI: https://doi.org/10.13029/jkaps.2017.23.2.29
Purpose

Minimally invasive surgery (MIS) in abdomen and thorax has been widely accepted for pediatric diseases. Thoracoscopic surgery has the advantage of less pain, better cosmetic outcomes and less musculoskeletal sequelae in comparison to open surgery. We would like to share our initial experience with thoracoscopic surgery performed by one pediatric surgeon.

Methods

We performed a retrospective review of patients who underwent thoracoscopic surgery by one pediatric surgeon between April 2010 and August 2017 in Department of Pediatric Surgery, Seoul National University Children's Hospital.

Results

There were totally 18 cases; 8 cases for esophageal atresia, 3 cases for congenital diaphragm hernia, 2 cases for diaphragm eventration, 2 cases for esophageal duplication cyst, 2 cases for pleural mass and 1 case for esophageal bronchus. At the operation, median age was 9.5 months (range, 0-259 months) and median body weight was 9.4 kg (range, 1.9-49.4 kg). Median operative time was 157.5 minutes (range, 45-335 minutes). There was no case of open conversion and 2 cases of minor leakage at anastomosis site in case of esophageal atresia. Median follow-up month was 5 months (range, 0-87 months). During follow-up, 4 cases of esophageal atresia showed anastomosis site narrowing and average 2.5 times (range, 1-5 times) of esophageal balloon dilatation was done.

Conclusion

We performed thoracoscopic surgery in case of esophageal, diaphragm disease and pleural mass. Thoracoscopic surgery can be an effective and feasible option of treatment for well-selected pediatric patients of intra-thoracic disease including esophagus, diaphragm and mediastinum disease.

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[English]
Prevalence and Significance of Immature Ganglion Cell in Hirschsprung's Disease
Hee-Beom Yang, Hyun-Young Kim, Soo-Hong Kim, Sung-Eun Jung, Kwi-Won Park
J Korean Assoc Pediatr Surg 2013;19(2):122-129.   Published online December 24, 2013
DOI: https://doi.org/10.13029/jkaps.2013.19.2.122

Immature ganglion cell (IGC) is known for its relationship with intestinal motility and its impact on postoperative functional outcomes of Hirschsprung's disease (HD). There are few studies on the relationship between intestinal dysmotility and IGC in HD patients. 67 patients pathologically diagnosed with HD and who received definitive operation in Seoul National University Children's Hospital from 2010 to 2011 were included. 10 patients were excluded due to inadequate immunohistochemical staining results. The proximal end of resected ganglionic segment was evaluated with immunohistochemistry examination with MAP-2, a marker of ganglionic cells and bcl-2, a marker of IGCs The median age at operation was 155 (15-4678) day-old. 55 (96.5%) patients positive for bcl-2, were regarded as having IGC, and 2 (3.5%) patients positive for MAP-2 but negative for bcl-2, were regarded as having only mature ganglion cells. In the bcl-2 positive group, there were 7 patients (12.7%) with constipation, 15 patients (27.3%) with soiling, 3 patients (5.5%) with perianal excoriation and 6 patients (10.9%) with medication use. In bcl-2 negative group, intestinal dysmotility was not seen. There was no statistical significance in the two groups. Considering that HD is diagnosed at a young age, the rate of IGC present is very high and it might be inappropriate to relate IGC to functional outcome at young ages.

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